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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Capitalized Computer Software, Additions | $ 145,000 | $ 0 | $ 111,000
Internal Costs to Develop Software | 0 | 0 | 0
Capitalized Computer Software, Amortization | $ 70,000 | $ 65,000 | $ 131,000
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 5 years |  |

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of expense for amortization of capitalized computer software costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the internal costs to develop software. + References No definition available. + Details
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- Details
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